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Finding the Fourth Proportional to 31,409.80, 47,114.70 and 12,698.80

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Solution

The fourth proportional to 31,409.80, 47,114.70 and 12,698.80 is: 19,048.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,409.80 : 47,114.70 = 12,698.80 : x
  2. Step 2: Convert to fraction form
    31,409.80/47,114.70 = 12,698.80/x
  3. Step 3: Cross multiply
    31,409.80x = 47,114.70 × 12,698.80
  4. Step 4: Simplify right side
    31,409.80x = 598,300,152.36
  5. Step 5: Solve for x
    x = 598,300,152.36/31,409.80
  6. Step 6: Final answer
    x = 19,048.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.